Air-water heat pump + solar thermal

The old song again, but for me an important question:

We are possibly planning a air-water heat pump and are unsure whether we should also treat ourselves to a solar thermal system for heating support (about 10 sqm with 600l storage).

Economically speaking, as far as I understand, it is probably not worthwhile. We simply envision being able to completely switch off the heat pump in the warmer months and rely only on hot water from the solar system (even though the heat pump would probably work most efficiently then, due to warm temperatures). In the transitional seasons, according to the manufacturer (LWC90 from Alpha Innotec), the heat pump would then be supported and so to speak "relieved" by the solar system. Allegedly, the COP value would increase overall by up to 10%.

Sensible or not? Here are a few details about our planned new build: Solid house made of 30 cm Poroton bricks + 10 cm WDVS polystyrene insulation Approx. 135 sqm living space Triple glazing Decentralized ventilation system Schiedel AERA Comfort (without heat recovery, since we are not convinced by it, we do not want fresh air from a duct system, but want to minimize ventilation heat losses) Roof structure with 20 cm insulation between rafters BRAAS roof tiles Basement as a white tank, 30 cm concrete + 10 cm perimeter insulation, floor insulation in the basement screed Large window area facing south, but also dormers facing north Designed for 2 adults and 2-3 children

Thanks for suggestions/help!

...From an economic point of view, as far as I understood, it probably isn’t worthwhile.

Understood or comprehended? Then why the question?

.... In the transitional seasons then would according to the manufacturer ....Supposedly the COP value would increase overall by up to 10% when calculated.

With so many subjunctives, that’s already suspicious. Take this statement into the contract so that the advertising nonsense becomes a legally binding guarantee of features. ;) Furthermore, the COP is largely uninteresting compared to the annual performance factor since it is performance- and not consumption-related. If COP, then the entire characteristic curve (working range)!

best regards